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Emulators written in JavaScript

A list of emulators written in the JavaScript programming language.

This list started as a compilation of JavaScript emulators posted to Echo JS over the years. If you know about any missing emulators, please consider adding them to the collection: the source for this page is available on GitHub. Thank you in advance.

Acorn

Altair

Amstrad

  • CPCBox - Amstrad CPC emulator in JavaScript (archive link)
  • CPC Tiny Emu - by Andre Weissflog (source)
  • Roland - An Amstrad CPC emulator written in JavaScript. (Source)

Apple

Atari

Commodore

Data General

DEC

Nintendo

  • 1964js - JavaScript port of the 1964 N64 emulator for Windows
  • CfxNES - JavaScript NES Emulator (Demo)
  • CycloaJS - JavaScript NES Emulator (Source)
  • em-fceux - an Emscripten port of FCEUX, an emulator of NES, Famicom, Famicom Disk System (FDS), and Dendy consoles. Demo site
  • GBA.js - Game Boy Advance in the Browser (Source)
  • IodineGBA - A GameBoy Advance emulator written entirely in JavaScript (Source)
  • gba.ninja - JavaScript port of VisualBoyAdvance-M, a GameBoy Advance emulator (Source)
  • JSNES - A JavaScript NES emulator (Source)
  • NESNES - JavaScript NES emulator, also available as a web component (Source)
  • Nezulator - A NES emulator in JavaScript
  • N64Wasm - A web based N64 Emulator (Source)
  • XNES - Experimental JavaScript Super Nintendo emulators (Source)
  • jsGB - A GameBoy emulator in JavaScript (Source)
  • jsGBC - GameBoy Color Emulator written in JavaScript (Source)
  • mupen64plus - A port of the popular Nintendo 64 emulator for the Web (Source)
  • n64js - An N64 emulator in JavaScript (Source)
  • pinky - A Rust based NES emulator ported to the web via WebAssembly (Source)
  • DeSmuME-wasm - A WebAssembly port of the DeSmuME Nintendo DS emulator (Demo)
  • Desmond.js - A portable/embeddable version of DeSmuME-wasm (Demo)
  • SkyEmu - SkyEmu is a low level GameBoy, GameBoy Color and Game Boy Advance emulator
  • CAMLBOY - A Game Boy emulator that runs in your browser written in OCaml
  • TinyGB - A GameBoy emulator that runs only in the terminal written in NodeJS

Robotron / VEB Mikroelektronik

Sega

Sinclair

Sony

  • eNGE - JavaScript browser based PSX emulator (runs games at full speed) (Source)
  • PSeudo - JavaScript/WebGL/WebAudio browser based PLAYSTATION emulator (aka PSX) (needs boot ROM image, not supplied) (Source)
  • PCSXjs - Modified PCSX-Reloaded compiled with Emscripten (Source)
  • WASMpsx - Easily embeddable fork of PCSXjs
  • kpspemu - PSP Emulator written in Kotlin for JVM, JS and Native
  • Play!.js - This is a port of Play!, a PlayStation2 emulator, running in a web browser

Tandy

Multi-system Emulators

  • JSMESS examples - The JavaScript MESS (Multi Emulator Super System) (Source) (Notes)
  • PCE - PC emulators in JavaScript (Atari ST, IBM PC 5150, Macintosh, RC759 Piccoline)
  • RetroArch - JavaScript port of RetroArch (bundles Gambatte (Gameboy), Genesis Plus GX, Handy (Lynx), Snes9x Next, VBA Next (GameBoy Advance), Tyrquake and FinalBurn Alpha)
  • RetroWeb - collection of JavaScript emulators and boot media, including Apple-IIe (VisiCalc), Macintosh (System 1.0), Atari 1040ST, Commodore 64, Amiga 500 (Workbench 1.3), IBM PC Model 5150 (PC-DOS, CP/M-86, Cassette Basic), IBM PC XT (DOS, GEM 1.2, VisiCalc, Windows 1.01, 8088 Corruption demo), RC759 Piccoline (Eliza, Bil-simulation, Concurrent CP/M-86), TRS-80.
  • YAKC - Z1013, Z9001, KC85/2 family, Speccy, CPC, Acorn Atom, C64, with integrated debugging UI (source)
  • Tiny Emulators - based on the same chip- and system-emulator source code as YAKC, but as minimal WASM apps without fluff (source)
  • EmulatorJS - Self-hosted emulator for various-systems.

PC Emulators

  • Em-DOSBox - An Emscripten port of DOSBox (Demo)
  • Halfix - x86 PC emulator that runs both natively and in the browser, via WebAssembly (Demo 1, Demo2)
  • js-dos - WebAssembly port of DOSBox (fork of Em-DOSBox with better js API) (Demo,Source)
  • JS/Linux - JavaScript PC emulator
  • JsDOSBox - JavaScript PC DOS emulator (Source)
  • PCjs - IBM PC Model 5150 emulator (Source)
  • QemuJS - An Emscripten port of QEMU (Demo)
  • Virtual x86 - x86 virtualization in your browser, recompiling x86 to wasm on the fly (Source)
  • jemul8 - An object-oriented JavaScript x86 emulator for Node.js and the Browser (Source)
  • jsbochs - Bochs PC emulator for the Browser (Source)
  • Boxedwine - An emulator that runs Windows applications using Wine and emulating a Linux kernel and CPU (Source)

Bare CPUs

  • 8008 running SCELBAL by Mark G. Arnold. ("SCELBAL is the only open-source, floating-point, high-level language ever implemented on the 8008")
  • 8080 CPU emulator - Intel 8080 CPU emulator running Space Invaders ROM (Source)
  • AVR8js - AVR architecture emulator, capable of running Arduino code (source)
  • EMF Arcade Invaders - EMF-based 8080 Emulator with Space Invaders ROM - by Steven Goodwin (@MarquisdeGeek) (Source)
  • 8086tiny running FreeDOS - An Emscriptem port of Adrian Cable's 8086tiny. Source, and other emulators ported by Clay Shippy, at https://github.com/tecan/emscripten-projects.
  • Angel - JavaScript RISC-V ISA simulator booting Linux in a web-browser
  • Angular 2 6502 written with TypeScript and Angular 2, by Jeremy Likness
  • ARM-js - An ARM emulator written in JavaScript (Source)
  • ASM80 - Online assembler for 8-bit microprocessors by Martin Malý. Includes emulation of several machines: 8080, Z80, 6502, 6809. (Sources)
  • Basic MIPS functional simulator by Mianzhi Wang (morriswmz). (Source)
  • Easy6502 - JavaScript 6502 tutorial and emulator (Source)
  • EduMIPS64 - Educational MIPS64 CPU, ported from Java by Andrea Spadaccini using GWT (see blog here.) (Source)
  • FRISCjs - an 8-register educational RISC from the University of Zagreb, with both assembler and front panel, by Ivan Žužak. Source
  • Imaginary 6502 - 6502 Emulator and Assembler
  • Intel 4004 emulator - by Maciej Szyc. Includes assembler and disassembler.
  • Intel 8080 CPU Emulator - Emulates a minimal Intel 8080 Microcomputer that runs CP/M
  • JavaScript 8080 Emulator - 8080 arcade game emulator in JavaScript
  • Mipsdis - MIPS disassembler that runs in the browser
  • RISC Relay Computer - Relay based computer project with a 16 bit RISC CPU. Emulator includes an assembler and source for a calculator program. By RJH. See website.
  • RISCVEMU - RISC-V emulator boots 64-bit Linux. By Fabrice Bellard.
  • RP2040js - Raspberry Pi Pico (RP2040 / Arm Cortex-M0+) emulator with C/C++/MicroPython/CircuitPython support (Source)
  • Simple 8-bit Assembler Simulator - Provides a simplified assembler syntax (based on NASM) and is simulating a x86 like CPU (Source)
  • uARM.wasm - ARMv5TE emulator running Linux in browsers (Source)
  • Unicorn.js - The Unicorn emulator framework, now available for JavaScript (Source)
  • Visual ARM1 - JavaScript/WebGL for ARM's first CPU, modelling 25000 transistors at switch level and animating the original chip layout - in 3D. See the blog post
  • Visual 6502 - JavaScript simulator for the 6502 CPU, modelling thousands of transistors at switch level and animating the original chip layout. See also expert mode.
  • Visual 6800 - JavaScript simulator for the Motorola 6800 CPU, modelling thousands of transistors at switch level and animating the original chip layout.
  • Visual Z80 - JavaScript simulator for the Z80 CPU, modelling thousands of transistors at switch level and animating the original chip layout.
  • Visulator - x86 machine emulator that visualizes how each instruction is processed (Source)
  • YAMD - Yet Another MIPS Debugger (Source)
  • jor1k - OpenRISC OR1K JavaScript emulator running Linux with network support (Source)
  • jslm32 - JavaScript LatticeMico32 emulator running Linux (Source)
  • ZUSIE - JavaScript simulation of Fredrik Andersson's homebrew relay machine inspired by Zuse's machines.

Early machines

Calculator emulators

Microcode-level calculators

Workalike calculators

Miscellaneous

Adventure Game Engines

  • Emscripten ScummVM - Emscripten fork of the ScummVM engine
  • IFVMS - Infocom/Inform Web interpreter
  • Parchment - Infocom/Inform Web interpreter
  • ZZTJS - ZZT game engine in JavaScript
  • ngPAWS - Professional Adventure Writer (PAW) Web interpreter

See also (lists of JavaScript emulators elsewhere)

Additional Information

This resource collection is maintained by Frederic Cambus.

License

CC0

To the extent possible under law, Frederic Cambus has waived all copyright and related or neighboring rights to this work.

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